2
+ |
1 |
3
1x
2
1x 1x
1
4
2x |
2x |
3 |
4 |
2x
1
5
1x
1
6
1x
|
1x |
2 |
3 |
7
1x
1x
4
8
1x 2x
5 |
2x |
|
|
|
6 |
9
2x
7
10
|
2x |
2x |
|
|
|
8 |
|
9 |
11
2x
10
12
|
1x |
2x |
|
|
|
11 |
|
12 |
13
1x
13
14
2x
14
15
1x
15
1 |
2 |
2
16
1x
16
1 |
2 |
3
17
2x
17
18
|
2x |
4x |
|
18 |
1 |
2 |
3 |
2x
19
2x
19
20
2x
20
21
2x
21
22
2x
22
23
2x |
2x |
23
24